TY - RPRT TI - Preliminary interpretation of a seismic-refraction profile across the Large Aperture Seismic Array, Montana AU - C.A. Borcherdt AU - John C. Roller PY - 1968 DO - 10.3133/ofr6815 UR - https://pubs.usgs.gov/publication/ofr6815 ID - ofr6815 ER -